.page-faq {
  --faq-line: rgba(255, 255, 255, 0.08);
  --faq-glass: rgba(19, 26, 36, 0.72);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 48px 0 34px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -160px;
  width: min(560px, 92vw);
  height: min(560px, 92vw);
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, rgba(255, 107, 26, 0.3), rgba(255, 107, 26, 0) 64%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 107, 26, 0.55), rgba(0, 229, 255, 0.32), rgba(255, 255, 255, 0));
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 20px;
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero .lede {
  max-width: 58ch;
  margin: 0;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-layout {
  display: block;
  padding: 36px 0 80px;
}

.page-faq .faq-toc {
  margin-bottom: 44px;
  padding: 20px 16px 22px;
  background: var(--ink-2);
  border-radius: var(--radius);
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-toc__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.page-faq .faq-toc__list a {
  display: block;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  color: var(--cream);
  font-size: 14px;
  line-height: 1.45;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  background: rgba(255, 107, 26, 0.13);
  color: var(--flame-soft);
}

.page-faq .faq-toc__list a span {
  margin-right: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--flame);
}

.page-faq .faq-body {
  display: flex;
  flex-direction: column;
  gap: 62px;
}

/* ---------- 章节 ---------- */
.page-faq .faq-block {
  scroll-margin-top: calc(var(--rail-h) + var(--strip-h) + 26px);
}

.page-faq .faq-block__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 14px;
}

.page-faq .faq-block__num {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 7.5vw, 56px);
  font-weight: 700;
  line-height: 0.92;
  color: transparent;
  -webkit-text-stroke: 1.2px var(--flame);
  text-stroke: 1.2px var(--flame);
}

.page-faq .faq-block__head h2 {
  margin: 8px 0 0;
  font-size: clamp(20px, 4.6vw, 32px);
  font-weight: 400;
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-faq .faq-block__intro p {
  max-width: 60ch;
  margin: 0 0 22px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 步骤 ---------- */
.page-faq .faq-steps {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 12px;
}

.page-faq .faq-steps li {
  position: relative;
  counter-increment: step;
  padding: 15px 18px 16px 54px;
  background: var(--faq-glass);
  border-radius: var(--radius-sm);
  border-left: 2px solid rgba(255, 107, 26, 0.4);
}

.page-faq .faq-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 17px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--flame);
  letter-spacing: 0.02em;
}

.page-faq .faq-steps strong {
  display: block;
  margin-bottom: 5px;
  color: var(--cream);
  font-size: 15px;
  font-weight: 500;
}

.page-faq .faq-steps p {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.72;
}

.page-faq .faq-steps a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}

.page-faq .faq-steps a:hover {
  color: var(--flame-soft);
  border-bottom-color: rgba(255, 107, 26, 0.5);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  padding: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 11px 16px 13px;
  font-size: 12.5px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-faq .faq-figure--tall {
  max-width: 430px;
}

/* ---------- 版本元数据 ---------- */
.page-faq .faq-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0 0 18px;
}

.page-faq .faq-meta__cell {
  padding: 14px 16px;
  background: var(--ink-2);
  border-radius: var(--radius-sm);
  border-top: 2px solid rgba(0, 229, 255, 0.35);
}

.page-faq .faq-meta__label {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-meta__value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 代码式提示 ---------- */
.page-faq .callout {
  margin: 0 0 22px;
  padding: 14px 16px;
  background: rgba(0, 229, 255, 0.06);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-faq .callout span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
}

/* ---------- 刷新节奏 ---------- */
.page-faq .faq-pulse {
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
}

.page-faq .faq-pulse__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  background: var(--ink-2);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--flame);
}

.page-faq .faq-pulse__row--cyan {
  border-left-color: var(--cyan);
}

.page-faq .faq-pulse__row--amber {
  border-left-color: var(--amber);
}

.page-faq .faq-pulse__key {
  font-size: 14px;
  color: var(--mist);
}

.page-faq .faq-pulse__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 5.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cream);
}

.page-faq .faq-pulse__unit {
  margin-left: 4px;
  font-size: 13px;
  font-weight: 400;
  color: var(--mist);
}

/* ---------- 设备适配 ---------- */
.page-faq .faq-devices {
  display: grid;
  gap: 0;
  margin: 0 0 22px;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-devices__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 13px 4px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-devices__name {
  font-size: 15px;
  color: var(--cream);
}

.page-faq .faq-devices__note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 问答折叠 ---------- */
.page-faq .qa {
  margin-top: 12px;
  background: var(--faq-glass);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.page-faq .qa[open] {
  background: var(--ink-2);
  border-left-color: var(--cyan);
}

.page-faq .qa summary {
  position: relative;
  padding: 14px 44px 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--cream);
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.55;
}

.page-faq .qa summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa summary::marker {
  content: "";
}

.page-faq .qa summary::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--flame);
  border-bottom: 2px solid var(--flame);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.25s ease;
}

.page-faq .qa[open] summary::after {
  transform: translateY(-25%) rotate(-135deg);
}

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--radius-sm);
}

.page-faq .qa__body {
  padding: 0 16px 16px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.78;
}

.page-faq .qa__body p {
  margin: 0 0 10px;
}

.page-faq .qa__body p:last-child {
  margin-bottom: 0;
}

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}

.page-faq .qa__body a:hover {
  color: var(--flame-soft);
  border-bottom-color: rgba(255, 107, 26, 0.5);
}

/* ---------- 联系 ---------- */
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0 0 18px;
}

.page-faq .faq-contact__item {
  padding: 15px 18px;
  background: var(--ink-2);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--flame);
}

.page-faq .faq-contact__label {
  display: block;
  margin-bottom: 7px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-contact__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
  word-break: break-word;
}

.page-faq .faq-contact__lead {
  max-width: 56ch;
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.78;
}

.page-faq .faq-contact__lead a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}

.page-faq .faq-contact__lead a:hover {
  color: var(--flame-soft);
  border-bottom-color: rgba(255, 107, 26, 0.5);
}

/* ---------- 渐进增强：无 JS 时全部可见 ---------- */
.page-faq [data-reveal] {
  opacity: 1;
}

/* ---------- 平板起 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-toc__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px 8px;
  }

  .page-faq .faq-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 76px 0 52px;
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
    gap: 68px;
    align-items: start;
    padding: 52px 0 104px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--rail-h) + var(--strip-h-d) + 24px);
    margin-bottom: 0;
  }

  .page-faq .faq-body {
    gap: 76px;
  }

  .page-faq .faq-figure--tall {
    max-width: 400px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-block__head h2 {
    margin-top: 12px;
  }

  .page-faq .faq-figure--wide {
    margin-top: 4px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa summary::after,
  .page-faq .faq-toc__list a {
    transition: none;
  }
}